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One recent study found that people were able to burn up an extra 450 calories a day with one hour of moderate exercise. That can include walking briskly, biking or swimming.

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President Barack Obama greets people outside the Old Market Deli in Cannon Falls, Minn., on the Aug. 15, during a Midwest bus tour. The same day he said he likes the term "Obamacare."

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What's in this vial changes from year to year, but the process of creating the flu vaccine remains pretty constant.

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